A vibration absorbing device includes a main board having a pole, a first retaining board fixed to the main board, a second retaining board fixed to the first retaining board opposite to the main board, a loading board including a main body and a flange protruding from the main body, an elastic element located between the pole and the main body. A sliding groove and a compartment are both defined between the first retaining board and the second retaining board, the flange is located but slidable in the sliding groove, the main body is located in the compartment. The loading board can slide in the sliding groove in compliance with shocks or vibration, while the elastic element deforms and releases to absorb the motion of the loading board.